Root OnePlus 2

Step 2: Once you have successfully unlocked the bootloader on OnePlus 2, then you need to install custom recovery (i.e TWRP or CWM recovery). For that you have to connect your device to the computer first then follow the below steps.

Step 3: Download SuperSU (latest) and move it to the root of the Phone SD memory.

Step 8: Now, you need to boot into the Fastboot Mode. To Boot into fastboot mode, press and hold the Volume UP and Power Key (for 4-5 seconds) and release all the the buttons when you are able to see the fastboot logo on the screen.

Step 9: Give the Following Command: fastboot devices

The above command helps to know the list of attached devices to the computer.

Step 11: Now, you will be able to see some processes on your Device screen.

Step 12: Now, you need to boot into the TWRP recovery Mode. To Boot into twrp recovery mode, press and hold the Volume Down and Power Key (for 4-5 seconds) and release all the the buttons when you are able to see the twrp recovery screen.

Step 13: Once you have booted into the TWRP recovery mode, Tap on the Install and select the SuperSU package that you have moved to the Phone SD in Step#3.

Step 14: Now, reboot your Device from the TWRP recovery.

Step 15: Once your Device is restarted you will be able to see the SuperSU icon in the Menu. Which confirms that you have successfully rooted your OnePlus 2.

Optional: You can also verify the root status of your device by using the Root Checker Application.